My father told me that Hakim bin Hizam manumitted one-hundred slaves in the Pre-Islamic period of ignorance and slaughtered one-hundred camels (and distributed them in charity). When he embraced Islam he again slaughtered one-hundred camels and manumitted one-hundred slaves. Hakim said, "I asked Messenger of Allah ﷺ, 'O Messenger of Allah ﷺ! What do you think about some good deeds I used to practice in the Pre-Islamic period of ignorance regarding them as deeds of righteousness?' Allah's Apostle said, "You have embraced Islam along with all those good deeds you did."  

فَسَأَلْتُ رَسُولَ اللَّهِ ﷺ فَقُلْتُ يَا رَسُولَ اللَّهِ أَرَأَيْتَ أَشْيَاءَ كُنْتُ أَصْنَعُهَا فِي الْجَاهِلِيَّةِ كُنْتُ أَتَحَنَّثُ بِهَا يَعْنِي أَتَبَرَّرُ بِهَا قَالَ فَقَالَ رَسُولُ اللَّهِ ﷺ أَسْلَمْتَ عَلَى مَا سَلَفَ لَكَ مِنْ خَيْرٍ